The blues you see are from painting cyanotype chemistry onto silver gelatin (darkroom) paper. The lumen process itself is what turns the paper other colors; however, the brown areas are from developer and a little other darkroom chemistry, which is the chemigram part.
I haven't decided which paper I'll make your PERKS on yet, but the colors will be a bit different, as each brand/type of paper responds differenty to the process. (Your blues will likely be bluer than they are in this print)